diff --git a/autocmake/interpolate.py b/autocmake/interpolate.py
index 50121c7..aeb54ed 100644
--- a/autocmake/interpolate.py
+++ b/autocmake/interpolate.py
@@ -33,22 +33,34 @@ def interpolate(d, d_map):
 
 
 def test_interpolate():
-
     d = {'foo': 'hey',
          'bar': 'ho',
          'one': 'hey %(foo) ho %(bar)',
          'two': {'one': 'hey %(foo) ho %(bar)',
                  'two': 'raboof'}}
-
     d_interpolated = {'foo': 'hey',
                       'bar': 'ho',
                       'one': 'hey hey ho ho',
                       'two': {'one': 'hey hey ho ho',
                               'two': 'raboof'}}
-
     assert interpolate(d, d) == d_interpolated
 
+
+def test_interpolate_int():
+    d = {'foo': 1,
+         'bar': 2,
+         'one': 'hey %(foo) ho %(bar)',
+         'two': {'one': 'hey %(foo) ho %(bar)',
+                 'two': 'raboof'}}
+    d_interpolated = {'foo': 1,
+                      'bar': 2,
+                      'one': 'hey 1 ho 2',
+                      'two': {'one': 'hey 1 ho 2',
+                              'two': 'raboof'}}
+    assert interpolate(d, d) == d_interpolated
+
+
+def test_interpolate_nested():
     d2 = {'modules': [{'fc': [{'source': '%(url_root)fc_optional.cmake'}]}], 'url_root': 'downloaded/downloaded_'}
     d2_interpolated = {'modules': [{'fc': [{'source': 'downloaded/downloaded_fc_optional.cmake'}]}], 'url_root': 'downloaded/downloaded_'}
-
     assert interpolate(d2, d2) == d2_interpolated